Four-section umbrella strut spreader structure

Abstract

The invention herein relates to a kind of four-section umbrella strut spreader structure that mainly offers a highly safe and smoothly operating umbrella strut spreader structure to increase overall practicality and which consists of a structural improvement within the strut spreader members through the addition of an upward facing U-shaped opening and a T-shaped guide on the third main strut member, wherein a leaf-type strut member is inserted through the U-shape opening to maintain smooth action during the opening and the folding of the umbrella. Furthermore, the third main strut member can be configured as a S-shaped strut spreader element to reduce the overall physical dimensions of the umbrella strut spreader rear ends.

What is claimed is: 
     
       1. A four-section umbrella strut spreader structure comprising: (a) a first main strut member having a U-shaped cross-sectional contour defining an upwardly directed opened section and an end section;   (b) a second main strut member having a U-shaped cross-sectional contour pivotally connected to said end section of said first main strut member, at a first end section of said second main strut member;   (c) a third main strut member having a U-shaped cross-sectional contour pivotally connected to said second main strut member at a second end section of said second main strut member;   (d) a T-shaped guide bolt secured to a base leg of said U-shaped cross-sectionally contoured second main strut member at a central section thereof, said T-shaped guide bolt having a head member and a bolt leg extending therefrom, said bolt leg having a horizontally guide opening formed therethrough; and,   (e) a leaf spring strut member extending through said guide opening and pivotally coupled on opposing ends thereof to said end section of said first main strut member and said third main strut member, whereby said T-shaped guide bolt maintains said leaf spring strut member substantially contiguous to said second main strut member at said central section.   
     
     
       2. The four-section umbrella strut spreader structure as recited in claim 1 where said third main strut member includes an elongated S-shaped contour whereby when said third main strut member is pivotally displaced into adjacent positional relation with respect to said second main strut member a reduced volume dimension is attained for said four-section umbrella strut spreader structure.